Nike Women's Optic Pop Crossback Tankini 84% polyester/16% spandex Hand Wash The Nike Optic Pop Crossback Women's Tank Swimsuit features removable soft cups for customizable support and coverage, and a unique crossback design offers increased range of motion. Removable cups for coverage and support. Adjustable ties for a customized fit. Crossback design and stretch fabric for wide range of motion. Fabric: 84% polyester/16% spandex.